JPH0676678B2 - Game coin and its manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal coin for a game machine and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, coins used in game machines such as slot machines installed in game centers and pachinko parlors are copper.
-Many nickel-plated brass products are used, but their color, shape, and design are monotonous, so their commercial value is low, and even if similar products are mixed, they are almost indistinguishable. There was a problem that it was very difficult to remove. The same is true for stainless steel coins, which have been increasing recently. Furthermore, since these coins are heavy in weight, the entire peripheral equipment for the game machine is burdened, and the useful life of the entire peripheral equipment for the game machine becomes short. Furthermore, copper-nickel-plated brass coins had the drawback that nickel adhered to the hands from the plated surface and gave a distinctive stain and smell when used.

Therefore, as a result of repeated studies in view of the above points, the present inventor has excellent water resistance, durability, wear resistance, etc.
The present invention has been completed to find a coin for a game machine which is light in weight, has hardness and strength required for a coin for a game machine, and is capable of distinguishing a great number of coins.

[0004]

That is, according to the present invention, an anodized film is formed on the surface of a coin body made of aluminum or an aluminum alloy, a bar code is printed on the anodized film, and the ink of the bar code is filmed. Characterized in that an anodized film is formed on the surface of the coin for a game machine and the coin body made of aluminum or an aluminum alloy, which is enclosed inside, a bar code is printed on the anodized film, and then a sealing treatment is performed. The present invention relates to a method for manufacturing coins for game machines.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A coin for a game machine according to the present invention will be described with reference to the drawings.

FIG. 1 is a plan view showing an example of an embodiment of a coin for a game machine according to the present invention, and FIG. 2 is a sectional view taken along the line AA. Note that FIG. 2 is exaggerated in the thickness direction of the coin.

In the drawings, reference numeral 1 denotes a coin body made of aluminum or an aluminum alloy, and an anodized film 2 is formed on the entire surface of the coin body 1. Reference numeral 3 is a bar code portion provided on the anodized film 2 on the front and back of the coin body.

In this embodiment, since the coin body 1 is made of aluminum or aluminum alloy, it is lightweight, and since the entire surface is covered with the anodic oxide film 2, the surface hardness is high and the wear resistance is high. It has excellent durability. Moreover, it does not have the drawbacks of peculiar stains and odors on the hands of a conventional brass-copper-nickel-plated coin. Further, since the bar code portion 3 of the coin body 1 is printed on the anodic oxide film 2 and various kinds can be provided, a very large number can be easily distinguished.

In this embodiment, the bar code portion is preferably provided radially on a part of the coin body 1 as shown by 3 in FIG. 1, but may be provided radially on the entire surface of the coin body. For example, they may be provided concentrically as shown by 13 in FIG.

Aluminum alloys used in the coin bodies 1 and 11 in the present invention include, for example, A 2017,
A 2024, A 5052, A 5056, A 5082, A 5083, A 7078 and the like can be mentioned, and among these, A 5082 and A 5083 are preferable from the viewpoint of cost and tension, rigidity and surface treatment property. .

The anodizing treatment of aluminum and aluminum alloys can be carried out by a usual method. Examples of the electrolytic solution used at this time include oxalic acid aqueous solution, sulfuric acid, chromic acid aqueous solution, and sulfosalicylic acid aqueous solution. Of these, sulfuric acid is preferable because it is easy to manage for general industrial use. The concentration when using these varies depending on the electrolytic solution, but is usually 10 to 30% (% by weight, the same below), preferably 16 to 18%, and the temperature is usually 10 to 25%.
C., preferably 18-21.degree. The reaction time is usually
It is carried out for 15 to 80 minutes, preferably 20 to 30 minutes, the voltage is 13 to 18 V, and the current density is 1 to 3 A / dm ² for direct current.

To provide a bar code on the surface of the coin body, a method of screen printing the bar code with a printing ink after forming the anodized film is used. The electrolytic solution used for forming this anodized film is preferably about 15% sulfuric acid because the film is colorless and transparent and has excellent penetrability for printing ink. The surface of the anodized film of aluminum and aluminum alloy is +
Since holes having an electric charge and a diameter of about 0.1 to 0.5 μm and a depth of about 5 to 25 μm are provided, a bar code is printed on this surface, and a pressure of ² to 5 kg / cm ² is applied to the holes on the film. steam,
Sealing is performed for 5 to 30 minutes with hot water of 70 to 95 ° C, nickel acetate aqueous solution of 5 to 10 g / l, and the like. By this,
The barcode ink is enclosed in the anodized film, and the adhesion of the barcode portion is improved.

As the step of performing the anodizing treatment, it is preferable to perform the degreasing treatment before the anodizing to remove the attached oil and fat, and then to perform etching in order to prevent uneven printing and sharpness. The degreasing treatment is carried out by using an organic solvent degreasing method using trichlorethylene, perchlorethylene, benzyl, etc., a preliminary degreasing method such as an alkaline degreasing method using an aqueous sodium carbonate solution, an aqueous sodium hydroxide solution or an emulsifier degreasing method, and a sodium hydroxide aqueous solution as a finishing degreasing method. It can be performed by a method such as an electrolytic degreasing method used. The etching can also be performed by a nozzle spraying method, a method using a diffusing solution by the beat method, an electrolytic corrosion method using an electrolyzer, or the like. Usually, alkaline etching using an alkaline solution as the corrosive solution is performed. Examples of the alkaline solution include sodium hydroxide aqueous solution and potassium hydroxide aqueous solution. These degreasing treatments, alkali etchings, and washings with water are performed between the steps of the anodic oxidation.

The coin body 1 or 11 can be obtained by punching the aluminum or aluminum alloy plate or strip and processing it into a disc by cold forging.

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1 An aluminum alloy (A 5082) plate was punched by a press machine and cut to form a coin body having a shape shown in FIGS. 1 and 2 (diameter 25 mm, minimum thickness 1.50 mm, maximum thickness). 1.60
mm) was prepared.

The coin body was degreased with trichlorethylene at 50 ° C. for 1 minute and washed with water. Next, the aluminum alloy plate that had been degreased and washed with water was alkali-etched with a 10% sodium hydroxide aqueous solution at 50 ° C. for 1 minute. Further, the aluminum alloy plate was washed with water.

Further, an aluminum plate washed with water after alkali etching was used at 20 ° C. using 15% sulfuric acid as an electrolytic solution.
Anodic polarization was performed for 30 minutes at a voltage of 15 V and a direct current of 1 A / dm ^{2 in} current density. As a result, a colorless and transparent anodized film was formed on the entire surface of the coin body.

Then, screen printing was performed using a black printing ink on both front and back surfaces of the coin body coated with the anodic oxide film, and a bar code as shown in FIG.

Further, sealing treatment was performed with high temperature water at 95 ° C. for 30 minutes to obtain coins.

Example 2 As in Example 1, the front and back surfaces of the coin body were coated with anodic oxide films, and then a barcode as shown in FIG. did.

Further, sealing treatment was carried out with high temperature water at 95 ° C. for 30 minutes to obtain coins.

Next, practical durability tests were conducted on the coins for game machines obtained in Examples 1 and 2.

1000 coins of the present invention were placed in a rotary barrel sander (manufactured by Tipton Espo Co., Ltd.) and continuously operated for 10 days. As a result, the coin of the present invention had no problems in hardness and strength, and the bar code of the coin was clearly held.

Further, a selection test was conducted on the coins for game machines obtained in Examples 1 and 2.

The coin obtained in Example 1 is usually rotated by rotating the coin, and the coin obtained in Example 2 is used in the diameter direction of the coin by a combination of a phototransistor and an infrared light emitting diode. The various barcodes printed on the coins were read by the barcode reader of No. 1, and the coins were selected. As a result, the coins of the present invention were selected by reading the bar code quickly and accurately.

[0027]

According to the present invention, an anodized film is formed on aluminum or an aluminum alloy, a bar code is printed on the film, and then a sealing treatment is performed.
Not only is it lightweight and has sufficient hardness and strength as a coin for game machines with aluminum or aluminum alloy, it also has excellent water resistance, durability, abrasion resistance, etc. that could not be obtained by conventional methods. Since various kinds of bar codes can be provided, a very large number of coins for game machines that can be easily distinguished can be manufactured. In addition, the coin of the present invention is easily available at low cost.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a plan view showing an example of an embodiment of the present invention.

[Explanation of symbols]

 1, 11 Coin body 2 Anodized film 3, 13 Bar code part

Claims (2)

[Claims] 1. A game machine in which an anodized film is formed on the surface of a coin body made of aluminum or an aluminum alloy, a bar code is printed on the anodized film, and the ink of the bar code is enclosed in the film. coin. 2. A coin for a game machine characterized in that an anodized film is formed on a surface of a coin body made of aluminum or an aluminum alloy, a bar code is printed on the anodized film, and then a sealing treatment is performed. Manufacturing method.